Discover Questions

At instant specified the magnitude of the vertical component of linear acceleration of the particle at the point B is what in fps per sec? If we used Einstein field equation of gravity field how far of would it be if we used Newton gravity field equation,to know gravity in space? Is the earth flat or a sphere and i want proof? What was the flaw in Einstein 2nd Postulate of Special Relativity Theory? Can I run an inverter type welder, rated at 3 Ph, 400V (for Europe), with 3Ph, 460V power, which is available in the United States?